{"id":41592,"date":"2025-06-03T23:27:30","date_gmt":"2025-06-03T15:27:30","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/41592.html"},"modified":"2025-06-03T23:27:30","modified_gmt":"2025-06-03T15:27:30","slug":"spring-boot-%e5%90%af%e5%8a%a8%e6%b5%81%e7%a8%8b%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90%ef%bc%9a%e4%bb%8e%e6%ba%90%e7%a0%81%e5%88%b0%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/41592.html","title":{"rendered":"Spring Boot \u542f\u52a8\u6d41\u7a0b\u6df1\u5ea6\u89e3\u6790\uff1a\u4ece\u6e90\u7801\u5230\u5b9e\u8df5"},"content":{"rendered":"<h4>Spring Boot \u542f\u52a8\u6d41\u7a0b\u6df1\u5ea6\u89e3\u6790&#xff1a;\u4ece\u6e90\u7801\u5230\u5b9e\u8df5<\/h4>\n<p>Spring Boot \u4f5c\u4e3a Java \u5f00\u53d1\u7684\u4e3b\u6d41\u6846\u67b6&#xff0c;\u5176 \u201c\u7ea6\u5b9a\u5927\u4e8e\u914d\u7f6e\u201d \u7684\u7406\u5ff5\u6781\u5927\u63d0\u5347\u4e86\u5f00\u53d1\u6548\u7387\u3002\u672c\u6587\u5c06\u4ece\u6e90\u7801\u5c42\u9762\u6df1\u5165\u89e3\u6790 Spring Boot \u7684\u542f\u52a8\u6d41\u7a0b&#xff0c;\u5e76\u901a\u8fc7\u4ee3\u7801\u793a\u4f8b\u5c55\u793a\u5176\u5de5\u4f5c\u673a\u5236\u3002<\/p>\n<h4>\u4e00\u3001Spring Boot \u542f\u52a8\u7684\u5165\u53e3\u70b9<\/h4>\n<p>Spring Boot \u5e94\u7528\u7684\u542f\u52a8\u901a\u5e38\u4ece\u4e00\u4e2a\u5305\u542bmain\u65b9\u6cd5\u7684\u7c7b\u5f00\u59cb&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;SpringBootApplication<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MyApplication<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">SpringApplication<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MyApplication<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">,<\/span> args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>&#064;SpringBootApplication\u662f\u4e00\u4e2a\u7ec4\u5408\u6ce8\u89e3&#xff0c;\u5305\u542b&#xff1a;<\/p>\n<ul>\n<li>&#064;SpringBootConfiguration&#xff1a;\u58f0\u660e\u8fd9\u662f\u4e00\u4e2a\u914d\u7f6e\u7c7b<\/li>\n<li>&#064;EnableAutoConfiguration&#xff1a;\u542f\u7528\u81ea\u52a8\u88c5\u914d\u673a\u5236<\/li>\n<li>&#064;ComponentScan&#xff1a;\u542f\u7528\u7ec4\u4ef6\u626b\u63cf<\/li>\n<\/ul>\n<p>SpringApplication.run()\u662f\u542f\u52a8\u7684\u6838\u5fc3\u65b9\u6cd5&#xff0c;\u4e0b\u9762\u6211\u4eec\u6df1\u5165\u5206\u6790\u5176\u6267\u884c\u6d41\u7a0b\u3002<\/p>\n<h4>\u4e8c\u3001SpringApplication \u7684\u521d\u59cb\u5316<\/h4>\n<p>\u5f53\u8c03\u7528SpringApplication.run()\u65f6&#xff0c;\u9996\u5148\u4f1a\u521b\u5efaSpringApplication\u5b9e\u4f8b&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">ConfigurableApplicationContext<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> primarySource<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token punctuation\">{<\/span> primarySource <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">ConfigurableApplicationContext<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> primarySources<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">SpringApplication<\/span><span class=\"token punctuation\">(<\/span>primarySources<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span>args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>SpringApplication\u7684\u6784\u9020\u51fd\u6570\u4f1a\u6267\u884c\u4e00\u7cfb\u5217\u521d\u59cb\u5316\u64cd\u4f5c&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">SpringApplication<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> primarySources<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">null<\/span><span class=\"token punctuation\">,<\/span> primarySources<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token annotation punctuation\">&#064;SuppressWarnings<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span> <span class=\"token string\">&#034;unchecked&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;rawtypes&#034;<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">SpringApplication<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ResourceLoader<\/span> resourceLoader<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> primarySources<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>resourceLoader <span class=\"token operator\">&#061;<\/span> resourceLoader<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Assert<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">notNull<\/span><span class=\"token punctuation\">(<\/span>primarySources<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;PrimarySources must not be null&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>primarySources <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LinkedHashSet<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span>primarySources<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ 1. \u5224\u65ad\u5e94\u7528\u7c7b\u578b&#xff08;REACTIVE, SERVLET, NONE&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>webApplicationType <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">WebApplicationType<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">deduceFromClasspath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ 2. \u8bbe\u7f6eApplicationContextInitializer<\/span><br \/>\n    <span class=\"token function\">setInitializers<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collection<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">getSpringFactoriesInstances<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ApplicationContextInitializer<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ 3. \u8bbe\u7f6eApplicationListener<\/span><br \/>\n    <span class=\"token function\">setListeners<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collection<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">getSpringFactoriesInstances<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ApplicationListener<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ 4. \u63a8\u65ad\u4e3b\u5e94\u7528\u7c7b&#xff08;\u5305\u542bmain\u65b9\u6cd5\u7684\u7c7b&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>mainApplicationClass <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">deduceMainApplicationClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5173\u952e\u6b65\u9aa4\u89e3\u6790&#xff1a;<\/p>\n<li>\u5e94\u7528\u7c7b\u578b\u63a8\u65ad&#xff1a;\u6839\u636e\u7c7b\u8def\u5f84\u4e2d\u7684\u7c7b\u63a8\u65ad\u5e94\u7528\u7c7b\u578b&#xff08;WebFlux\u3001Servlet \u6216\u666e\u901a\u5e94\u7528&#xff09;<\/li>\n<li>\u521d\u59cb\u5316\u5668\u52a0\u8f7d&#xff1a;\u4eceMETA-INF\/spring.factories\u52a0\u8f7dApplicationContextInitializer<\/li>\n<li>\u76d1\u542c\u5668\u52a0\u8f7d&#xff1a;\u4eceMETA-INF\/spring.factories\u52a0\u8f7dApplicationListener<\/li>\n<li>\u4e3b\u5e94\u7528\u7c7b\u63a8\u65ad&#xff1a;\u901a\u8fc7\u6808\u8f68\u8ff9\u627e\u5230\u5305\u542b main \u65b9\u6cd5\u7684\u7c7b<\/li>\n<h4>\u4e09\u3001SpringApplication.run () \u65b9\u6cd5\u89e3\u6790<\/h4>\n<p>run()\u65b9\u6cd5\u662f Spring Boot \u542f\u52a8\u7684\u6838\u5fc3\u903b\u8f91&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">ConfigurableApplicationContext<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">long<\/span> startTime <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">nanoTime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">DefaultBootstrapContext<\/span> bootstrapContext <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">createBootstrapContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">ConfigurableApplicationContext<\/span> context <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">configureHeadlessProperty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ 1. \u83b7\u53d6\u5e76\u542f\u52a8\u6240\u6709SpringApplicationRunListener<\/span><br \/>\n    <span class=\"token class-name\">SpringApplicationRunListeners<\/span> listeners <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getRunListeners<\/span><span class=\"token punctuation\">(<\/span>args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    listeners<span class=\"token punctuation\">.<\/span><span class=\"token function\">starting<\/span><span class=\"token punctuation\">(<\/span>bootstrapContext<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>mainApplicationClass<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">ApplicationArguments<\/span> applicationArguments <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DefaultApplicationArguments<\/span><span class=\"token punctuation\">(<\/span>args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 2. \u51c6\u5907\u73af\u5883<\/span><br \/>\n        <span class=\"token class-name\">ConfigurableEnvironment<\/span> environment <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">prepareEnvironment<\/span><span class=\"token punctuation\">(<\/span>listeners<span class=\"token punctuation\">,<\/span> bootstrapContext<span class=\"token punctuation\">,<\/span> applicationArguments<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">configureIgnoreBeanInfo<\/span><span class=\"token punctuation\">(<\/span>environment<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 3. \u6253\u5370Banner<\/span><br \/>\n        <span class=\"token class-name\">Banner<\/span> printedBanner <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">printBanner<\/span><span class=\"token punctuation\">(<\/span>environment<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 4. \u521b\u5efaApplicationContext<\/span><br \/>\n        context <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">createApplicationContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        context<span class=\"token punctuation\">.<\/span><span class=\"token function\">setApplicationStartup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>applicationStartup<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 5. \u51c6\u5907\u4e0a\u4e0b\u6587<\/span><br \/>\n        <span class=\"token function\">prepareContext<\/span><span class=\"token punctuation\">(<\/span>bootstrapContext<span class=\"token punctuation\">,<\/span> context<span class=\"token punctuation\">,<\/span> environment<span class=\"token punctuation\">,<\/span> listeners<span class=\"token punctuation\">,<\/span> applicationArguments<span class=\"token punctuation\">,<\/span> printedBanner<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 6. \u5237\u65b0\u4e0a\u4e0b\u6587<\/span><br \/>\n        <span class=\"token function\">refreshContext<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 7. \u5237\u65b0\u540e\u7684\u5904\u7406<\/span><br \/>\n        <span class=\"token function\">afterRefresh<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">,<\/span> applicationArguments<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 8. \u8ba1\u65f6\u7ed3\u675f<\/span><br \/>\n        <span class=\"token class-name\">Duration<\/span> timeTakenToStartup <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Duration<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">ofNanos<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">nanoTime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> startTime<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>logStartupInfo<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">StartupInfoLogger<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>mainApplicationClass<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">logStarted<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">getApplicationLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> timeTakenToStartup<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token comment\">\/\/ 9. \u53d1\u5e03\u5e94\u7528\u542f\u52a8\u5b8c\u6210\u4e8b\u4ef6<\/span><br \/>\n        listeners<span class=\"token punctuation\">.<\/span><span class=\"token function\">started<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">,<\/span> timeTakenToStartup<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 10. \u8c03\u7528\u6240\u6709Runners<\/span><br \/>\n        <span class=\"token function\">callRunners<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">,<\/span> applicationArguments<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Throwable<\/span> ex<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">handleRunFailure<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">,<\/span> ex<span class=\"token punctuation\">,<\/span> listeners<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalStateException<\/span><span class=\"token punctuation\">(<\/span>ex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ 11. \u53d1\u5e03\u5e94\u7528\u5c31\u7eea\u4e8b\u4ef6<\/span><br \/>\n        <span class=\"token class-name\">Duration<\/span> timeTakenToReady <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Duration<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">ofNanos<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">nanoTime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> startTime<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        listeners<span class=\"token punctuation\">.<\/span><span class=\"token function\">ready<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">,<\/span> timeTakenToReady<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Throwable<\/span> ex<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>context <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            context<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalStateException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Error handling failed&#034;<\/span><span class=\"token punctuation\">,<\/span> ex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalStateException<\/span><span class=\"token punctuation\">(<\/span>ex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> context<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u56db\u3001\u5173\u952e\u6b65\u9aa4\u8be6\u89e3<\/h4>\n<h5>1. \u542f\u52a8\u76d1\u542c\u5668&#xff08;SpringApplicationRunListeners&#xff09;<\/h5>\n<p>Spring Boot \u901a\u8fc7\u4e8b\u4ef6\u673a\u5236\u5728\u542f\u52a8\u7684\u4e0d\u540c\u9636\u6bb5\u53d1\u5e03\u4e8b\u4ef6&#xff0c;\u5141\u8bb8\u5f00\u53d1\u8005\u4ecb\u5165&#xff1a;<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token class-name\">SpringApplicationRunListeners<\/span> <span class=\"token function\">getRunListeners<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> types <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">SpringApplication<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">SpringApplicationRunListeners<\/span><span class=\"token punctuation\">(<\/span>logger<span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token function\">getSpringFactoriesInstances<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">SpringApplicationRunListener<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">,<\/span> types<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>applicationStartup<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6838\u5fc3\u76d1\u542c\u5668\u5305\u62ecEventPublishingRunListener&#xff0c;\u5b83\u4f1a\u53d1\u5e03\u4e00\u7cfb\u5217\u4e8b\u4ef6&#xff1a;<\/p>\n<ul>\n<li>ApplicationStartingEvent<\/li>\n<li>ApplicationEnvironmentPreparedEvent<\/li>\n<li>ApplicationContextInitializedEvent<\/li>\n<li>ApplicationPreparedEvent<\/li>\n<li>ApplicationStartedEvent<\/li>\n<li>ApplicationReadyEvent<\/li>\n<\/ul>\n<h5>2. \u73af\u5883\u51c6\u5907&#xff08;prepareEnvironment&#xff09;<\/h5>\n<p>\u73af\u5883\u51c6\u5907\u5305\u62ec\u521b\u5efa\u5e76\u914d\u7f6eConfigurableEnvironment&#xff0c;\u52a0\u8f7d\u5c5e\u6027\u6e90\u548c\u914d\u7f6e\u6587\u4ef6&#xff1a;<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token class-name\">ConfigurableEnvironment<\/span> <span class=\"token function\">prepareEnvironment<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        <span class=\"token class-name\">SpringApplicationRunListeners<\/span> listeners<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token class-name\">DefaultBootstrapContext<\/span> bootstrapContext<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token class-name\">ApplicationArguments<\/span> applicationArguments<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u521b\u5efa\u73af\u5883&#xff08;Web\u6216\u975eWeb&#xff09;<\/span><br \/>\n    <span class=\"token class-name\">ConfigurableEnvironment<\/span> environment <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getOrCreateEnvironment<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u914d\u7f6e\u73af\u5883<\/span><br \/>\n    <span class=\"token function\">configureEnvironment<\/span><span class=\"token punctuation\">(<\/span>environment<span class=\"token punctuation\">,<\/span> applicationArguments<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSourceArgs<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">ConfigurationPropertySources<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">attach<\/span><span class=\"token punctuation\">(<\/span>environment<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u53d1\u5e03\u73af\u5883\u51c6\u5907\u4e8b\u4ef6<\/span><br \/>\n    listeners<span class=\"token punctuation\">.<\/span><span class=\"token function\">environmentPrepared<\/span><span class=\"token punctuation\">(<\/span>bootstrapContext<span class=\"token punctuation\">,<\/span> environment<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">bindToSpringApplication<\/span><span class=\"token punctuation\">(<\/span>environment<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>isCustomEnvironment<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        environment <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">EnvironmentConverter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">getClassLoader<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">convertEnvironmentIfNecessary<\/span><span class=\"token punctuation\">(<\/span>environment<span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token function\">deduceEnvironmentClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token class-name\">ConfigurationPropertySources<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">attach<\/span><span class=\"token punctuation\">(<\/span>environment<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> environment<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>3. \u521b\u5efa\u5e94\u7528\u4e0a\u4e0b\u6587&#xff08;createApplicationContext&#xff09;<\/h5>\n<p>\u6839\u636e\u5e94\u7528\u7c7b\u578b\u521b\u5efa\u4e0d\u540c\u7684ApplicationContext&#xff1a;<\/p>\n<p><span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">ConfigurableApplicationContext<\/span> <span class=\"token function\">createApplicationContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> contextClass <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>applicationContextClass<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>contextClass <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u6839\u636e\u5e94\u7528\u7c7b\u578b\u9009\u62e9\u4e0a\u4e0b\u6587\u7c7b<\/span><br \/>\n            <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>webApplicationType<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">case<\/span> <span class=\"token constant\">SERVLET<\/span><span class=\"token operator\">:<\/span><br \/>\n                    contextClass <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Class<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">DEFAULT_SERVLET_WEB_CONTEXT_CLASS<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">case<\/span> <span class=\"token constant\">REACTIVE<\/span><span class=\"token operator\">:<\/span><br \/>\n                    contextClass <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Class<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">DEFAULT_REACTIVE_WEB_CONTEXT_CLASS<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n                    contextClass <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Class<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">DEFAULT_CONTEXT_CLASS<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ClassNotFoundException<\/span> ex<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalStateException<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                    <span class=\"token string\">&#034;Unable to create a default ApplicationContext, please specify an ApplicationContextClass&#034;<\/span><span class=\"token punctuation\">,<\/span> ex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ConfigurableApplicationContext<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token class-name\">BeanUtils<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">instantiateClass<\/span><span class=\"token punctuation\">(<\/span>contextClass<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>4. \u51c6\u5907\u5e94\u7528\u4e0a\u4e0b\u6587&#xff08;prepareContext&#xff09;<\/h5>\n<p>\u5bf9\u521b\u5efa\u597d\u7684\u4e0a\u4e0b\u6587\u8fdb\u884c\u521d\u59cb\u5316&#xff0c;\u5305\u62ec\u8bbe\u7f6e\u73af\u5883\u3001\u52a0\u8f7d\u6e90\u3001\u5e94\u7528\u521d\u59cb\u5316\u5668\u7b49&#xff1a;<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">prepareContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">DefaultBootstrapContext<\/span> bootstrapContext<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">ConfigurableApplicationContext<\/span> context<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token class-name\">ConfigurableEnvironment<\/span> environment<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">SpringApplicationRunListeners<\/span> listeners<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token class-name\">ApplicationArguments<\/span> applicationArguments<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Banner<\/span> printedBanner<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u73af\u5883<\/span><br \/>\n    context<span class=\"token punctuation\">.<\/span><span class=\"token function\">setEnvironment<\/span><span class=\"token punctuation\">(<\/span>environment<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5e94\u7528\u4e0a\u4e0b\u6587\u540e\u7f6e\u5904\u7406\u5668<\/span><br \/>\n    <span class=\"token function\">postProcessApplicationContext<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5e94\u7528\u521d\u59cb\u5316\u5668<\/span><br \/>\n    <span class=\"token function\">applyInitializers<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u53d1\u5e03\u4e0a\u4e0b\u6587\u521d\u59cb\u5316\u4e8b\u4ef6<\/span><br \/>\n    listeners<span class=\"token punctuation\">.<\/span><span class=\"token function\">contextPrepared<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>logStartupInfo<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">logStartupInfo<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">logStartupProfileInfo<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6dfb\u52a0\u8d44\u6e90\u52a0\u8f7d\u5668\u548c\u4e3b\u5e94\u7528\u7c7b<\/span><br \/>\n    <span class=\"token class-name\">ConfigurableListableBeanFactory<\/span> beanFactory <span class=\"token operator\">&#061;<\/span> context<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBeanFactory<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    beanFactory<span class=\"token punctuation\">.<\/span><span class=\"token function\">registerSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;springApplicationArguments&#034;<\/span><span class=\"token punctuation\">,<\/span> applicationArguments<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>printedBanner <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        beanFactory<span class=\"token punctuation\">.<\/span><span class=\"token function\">registerSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;springBootBanner&#034;<\/span><span class=\"token punctuation\">,<\/span> printedBanner<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u61d2\u52a0\u8f7d<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>beanFactory <span class=\"token keyword\">instanceof<\/span> <span class=\"token class-name\">DefaultListableBeanFactory<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">DefaultListableBeanFactory<\/span><span class=\"token punctuation\">)<\/span> beanFactory<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">setAllowBeanDefinitionOverriding<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>allowBeanDefinitionOverriding<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u52a0\u8f7d\u6e90&#xff08;\u4e3b\u914d\u7f6e\u7c7b&#xff09;<\/span><br \/>\n    <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> sources <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getAllSources<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Assert<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">notEmpty<\/span><span class=\"token punctuation\">(<\/span>sources<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Sources must not be empty&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">load<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">,<\/span> sources<span class=\"token punctuation\">.<\/span><span class=\"token function\">toArray<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u53d1\u5e03\u4e0a\u4e0b\u6587\u52a0\u8f7d\u5b8c\u6210\u4e8b\u4ef6<\/span><br \/>\n    listeners<span class=\"token punctuation\">.<\/span><span class=\"token function\">contextLoaded<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>5. \u5237\u65b0\u5e94\u7528\u4e0a\u4e0b\u6587&#xff08;refreshContext&#xff09;<\/h5>\n<p>\u8c03\u7528AbstractApplicationContext.refresh()\u65b9\u6cd5&#xff0c;\u8fd9\u662f Spring \u6846\u67b6\u7684\u6838\u5fc3\u903b\u8f91&#xff0c;\u5305\u62ec&#xff1a;<\/p>\n<ul>\n<li>BeanFactory \u7684\u521b\u5efa\u4e0e\u521d\u59cb\u5316<\/li>\n<li>BeanDefinition \u7684\u52a0\u8f7d<\/li>\n<li>Bean \u7684\u521b\u5efa\u4e0e\u4f9d\u8d56\u6ce8\u5165<\/li>\n<li>\u81ea\u52a8\u88c5\u914d\u7684\u5904\u7406<\/li>\n<li>\u4e8b\u4ef6\u53d1\u5e03\u5668\u7684\u521d\u59cb\u5316<\/li>\n<li>\u5d4c\u5165\u5f0f Servlet \u5bb9\u5668\u7684\u542f\u52a8&#xff08;\u5982\u679c\u662f Web \u5e94\u7528&#xff09;<\/li>\n<\/ul>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">refreshContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ConfigurableApplicationContext<\/span> context<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>registerShutdownHook<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            context<span class=\"token punctuation\">.<\/span><span class=\"token function\">registerShutdownHook<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">AccessControlException<\/span> ex<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ Not allowed in some environments.<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">refresh<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">refresh<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ConfigurableApplicationContext<\/span> context<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    context<span class=\"token punctuation\">.<\/span><span class=\"token function\">refresh<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>6. \u8c03\u7528\u5e94\u7528 Runner&#xff08;callRunners&#xff09;<\/h5>\n<p>\u542f\u52a8\u5b8c\u6210\u540e&#xff0c;\u8c03\u7528\u6240\u6709\u5b9e\u73b0\u4e86ApplicationRunner\u6216CommandLineRunner\u7684 Bean&#xff1a;<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">callRunners<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ApplicationContext<\/span> context<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">ApplicationArguments<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> runners <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6dfb\u52a0\u6240\u6709ApplicationRunner<\/span><br \/>\n    runners<span class=\"token punctuation\">.<\/span><span class=\"token function\">addAll<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBeansOfType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ApplicationRunner<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">values<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6dfb\u52a0\u6240\u6709CommandLineRunner<\/span><br \/>\n    runners<span class=\"token punctuation\">.<\/span><span class=\"token function\">addAll<\/span><span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBeansOfType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">CommandLineRunner<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">values<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6392\u5e8f<\/span><br \/>\n    <span class=\"token class-name\">AnnotationAwareOrderComparator<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>runners<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8c03\u7528<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Object<\/span> runner <span class=\"token operator\">:<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LinkedHashSet<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span>runners<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>runner <span class=\"token keyword\">instanceof<\/span> <span class=\"token class-name\">ApplicationRunner<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">callRunner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ApplicationRunner<\/span><span class=\"token punctuation\">)<\/span> runner<span class=\"token punctuation\">,<\/span> args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>runner <span class=\"token keyword\">instanceof<\/span> <span class=\"token class-name\">CommandLineRunner<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">callRunner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">CommandLineRunner<\/span><span class=\"token punctuation\">)<\/span> runner<span class=\"token punctuation\">,<\/span> args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u4e94\u3001\u81ea\u5b9a\u4e49\u542f\u52a8\u6d41\u7a0b<\/h4>\n<p>\u5f00\u53d1\u8005\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u81ea\u5b9a\u4e49\u542f\u52a8\u6d41\u7a0b&#xff1a;<\/p>\n<h5>1. \u6dfb\u52a0 ApplicationContextInitializer<\/h5>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">CustomApplicationContextInitializer<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">ApplicationContextInitializer<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">ConfigurableApplicationContext<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">initialize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ConfigurableApplicationContext<\/span> applicationContext<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5728\u4e0a\u4e0b\u6587\u5237\u65b0\u524d\u6267\u884c\u81ea\u5b9a\u4e49\u903b\u8f91<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Custom initializer called&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u518c\u65b9\u5f0f&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;SpringBootApplication<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MyApplication<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">SpringApplication<\/span> app <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">SpringApplication<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MyApplication<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        app<span class=\"token punctuation\">.<\/span><span class=\"token function\">addInitializers<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">CustomApplicationContextInitializer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        app<span class=\"token punctuation\">.<\/span><span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span>args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>2. \u6dfb\u52a0 ApplicationListener<\/h5>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">CustomApplicationListener<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">ApplicationListener<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">ApplicationStartedEvent<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">onApplicationEvent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ApplicationStartedEvent<\/span> event<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5e94\u7528\u542f\u52a8\u540e\u6267\u884c<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Application started!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u518c\u65b9\u5f0f&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;SpringBootApplication<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MyApplication<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">SpringApplication<\/span> app <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">SpringApplication<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MyApplication<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        app<span class=\"token punctuation\">.<\/span><span class=\"token function\">addListeners<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">CustomApplicationListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        app<span class=\"token punctuation\">.<\/span><span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span>args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>3. \u5b9e\u73b0 CommandLineRunner \u6216 ApplicationRunner<\/h5>\n<p><span class=\"token annotation punctuation\">&#064;Component<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">CustomCommandLineRunner<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">CommandLineRunner<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">Exception<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token 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